Effect of Temperature on Hydrogen Diffusion in Pipeline and Tubing Steels

Hydrogen diffusion plays a key role in determining the performance and reliability of pipeline steels operating in hydrogen-containing environments. This study investigates the effect of temperature on hydrogen permeation in three widely used steel grades: T95, P110, and X60, employing the Devanathan–Stachurski electrochemical technique. Electrochemical permeation tests were performed at various temperatures to evaluate the diffusion behavior of hydrogen through each steel. The analysis focuses on the determination of diffusion coefficients from lag time and steady-state permeation current data. The influence of temperature is discussed in relation to microstructural features and potential hydrogen trapping phenomena. The results aim to provide insight into how temperature affects hydrogen mobility in different pipeline steels, supporting material selection and integrity assessment strategies in hydrogen-related service conditions.